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DuoGuard 3" Tab - 10 #

Price: $39.95
Item Number: 0033908
Manufacturer: GLB


  • Sanitizes and prevents algae
  • Good for all pool surfaces
  • Stabilized for extended chlorine life

Add one tablet per 10,000 gallons of pool water every week or as often as needed to maintain a chlorine residual at 1.0 to 4.0 ppm. Follow “METHOD OF APPLICATION”. This dosage may vary depending upon bather load, water temperature and other conditions. Pool should not be entered until the chlorine residual is 1-4 ppm as measured with a reliable test kit. As a preventative treatment, you should shock treat your pool once per week to prevent pool problems. In addition to weekly shock treatment, you should shock treat to remedy problems which may occur when bathing loads are high, water appears hazy or dull, unpleasant odors or eye irritation occur, after heavy wind and rainstorms, or if algae does develop with resulting green color and slimy feeling.

Water Balance:
To provide optimum product performance, swimmer comfort and crystal clear water always maintain pH from 7.2 to 7.6, total alkalinity from 80 to 120 parts per million (ppm), and calcium hardness above 200 ppm. Test frequently using a GLB™ 4-Way Test Strips that measures all these ranges. Make any necessary adjustments promptly with the appropriate GLB™ pool care products. Re-entry into treated pools is prohibited with chlorine levels above 4 ppm for risk of bodily injury.

Shock Treatment:
Adjust pH to 7.2 to 7.6 with GLB™ pH Up or GLB™ pH Down per label directions. Shock treat weekly with a product such as Oxy-Brite™ non-chlorine shock oxidizer, Shoxidizer™ shock oxidizer or GLB™ SuperSonic to kill bacteria, control algae, burn out organic material and to keep water sparkling clear. Follow label directions.

Algae Control:
If pool surface develops algae or feels slippery, follow shock treatment directions. Immediately after shock treatment, thoroughly clean pool by scrubbing surface of algae growth, vacuum and cycle through filter. If necessary, repeat the procedure. Pool should not be entered until the chlorine residual is 1-4 ppm.

10 lbs.
22.5 lbs

Compatible With:

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